BIGTREETECH SKR 2 - cdn-3d.niceshops.com

1 Shenzhen BIGTREE technology co., LTD. BIG TREE TECH BIGTREETECH SKR 2 User Guide Shenzhen BIGTREE technology co., LTD. BIG TREE TECH I. Introduction to SKR Motherboard The BIGTREETECH SKR 2 motherboard is a 32-bit 3D printer motherboard designed and manufactured by the 3D printing team of Shenzhen BIQU Technology Co., Ltd. It is a successor to the and Turbo series of motherboards and adds many features that we are sure the community will love. 1. Main board features: 1) Uses a 32-bit ARM Cortex-M4 series STM32F407 VGT6 main control chip with a core frequency of 168 MHz that packs enough performance to run even the most demanding UI while ensuring stutter free printing. 2) Integrates a AOZ1284PI power regulator which supports 12-24V power input and a maximum output current of 4A enough to power external components such as LEDs and even a raspberry pi; 3) Support all versions of the company's serial screen, SPI screen and LCD screen; 4) Upgrade the configuration firmware via SD card.

2 This burning method is simple, convenient and efficient; 5) TMC Motor drivers can be used in SPI or UART mode by simply adjusting the onboard jumpers beneath each motor driver. Additionally you can connect or disconnect the TMC DIAG pin using an onboard jumper allowing you to use hard endstops or sensorless homing without the need to cut any pins. 6) Supports functions such as power loss print resume, filament runout detection, shutdown after printing, BLtouch and other ABL sensors, RGB lights, etc. Note that external modules will be required for many of these functions; 7) Use high-performance MOSFET to reduce heat generation; 8) The use of replaceable fuses makes the replacement process more convenient; 9) Includes a protection circuit on thermistor inputs which protects against short circuits between the heater cartridge and the bed heating element.

3 This is a common mistake made by many users when replacing a nozzle or working on the hotend so we expect this feature to be a welcome one; 10) Includes an additional heater protection circuit which protects against runaway heating on the bed and hotend heaters. By default, the heaters are off so if the MCU or MOSFETs are damaged, the heaters will shut down instead of enter into thermal runaway; 11) Introduces a new anti-reversal stepper driver protection which is achieved through a combination of new hardware and Marlin firmware. This protects against motherboard or driver damage due to incorrect driver insertion; 12) ESP8266 WIFI module (ESP12S or ESP-07) interface for customers to use RRF firmware; 13) Onboard push-pull TF card slot (SDIO working mode) and U disk interface; Shenzhen BIGTREE technology co.

4 , LTD. BIG TREE TECH 14) A filter circuit is added to the power input terminal to reduce ripple and noise interference; 15) The fuses now use a smaller package which leaves more space on the PCB for more features and makes it easier to swap them out; 16) The number of PWM controllable fan interfaces has been increased from one to three. 2. Main board parameters: Appearance size: 110*85mm For details, please refer to: BIGTREETECH SKR installation size: 102*76mm Microprocessor: ARM Cortex-M4 CPU STM32F407 VGT6 Input voltage: DC12V-DC24V Logic voltage: DC Firmware support: Marlin, Reprap Firmware WIFI interface: ESP-12S, ESP-07S Fan interface: three CNC fans, two normally closed fans (non-controllable) Expansion interface: I2C, Servos, Probe, PS-ON, PWR-DET, Fil-DET, RGB, etc.

5 Motor driver: support TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, ST820, LV8729, DRV8825, A4988, etc., and can be externally connected to a motor drive Drive working mode support: SPI, UART, STEP/DIR Motor drive interface: X, Y, Z (double Z axis), E0, E1, five channels (each channel has a closed loop drive interface) Temperature sensor interface: TH0, TH1, TB, 3 channels 100K NTC (thermal resistance) Display: serial touch screen, SPI touch screen, LCD display PC communication interface: square USB, easy to plug and unplug, communication baud rate 115200 Support file format: G-code Support machine structure: XYZ, delta, kossel, Ultimaker, corexy Recommended software: cura , Simplify3D, pronterface, Repetier-host, Makerware II.

6 Power on the motherboard After the SKR motherboard is powered on, the D6 LED will light up, indicating that the power supply is at nominal levels. The 5V SEL jumper, in the middle of the board, allows you to select whether you would like to use the 5V USB power input or the onboard 5V regulated supply. Configure the jumper as shown below: Shenzhen BIGTREE technology co., LTD. BIG TREE TECH 1) When using USB to power the motherboard: 2) When using 12V-24V power supply: III. Communication between motherboard and computer When using firmware the motherboard will enumerate as a virtual serial port in both macOS and windows. An example of the enumerated device within the windows device manager is shown below.

7 Shenzhen BIGTREE technology co., LTD. BIG TREE TECH IV. Motherboard interface description 1. Motherboard size: 2. Motherboard wiring diagram: Shenzhen BIGTREE technology co., LTD. BIG TREE TECH 3. Selection method of drive working mode: Normal STEP/DIR mode: (such as: A4988, DRV8825, LV8729, ST820, etc.) according to the drive subdivision table to select the shorting cap to short-circuit MS0-MS2. Note: If you use A4988 or DRV8825 driver, you must short-circuit RST and SLP with a jumper cap to work normally. Shenzhen BIGTREE technology co., LTD. BIG TREE TECH UART mode driven by TMC: (such as: TMC2208, TMC2209, TMC2225, etc.) Each axis uses a shorting cap to short the position of the red box in the figure, and the subdivision and drive current are set by firmware.

8 Shenzhen BIGTREE technology co., LTD. BIG TREE TECH SPI mode of TMC drive: (such as: TMC2130, TMC5160, TMC5161, etc.) Use four shorting caps for each axis to short the position of the red box in the figure, and the subdivision and drive current can be set by firmware. DIAG Pin of TMC drive: As shown in the picture, insert the short-circuit cap when using the sensorlesshoming function, and do not insert it when not using it. There is no need to cut the driving diag pin. Shenzhen BIGTREE technology co., LTD. BIG TREE TECH 4. The connection between BIGTREETECH SKR 2 and BLtouch: 5. Connection between BIGTREETECH SKR 2 and shutdown (Relay ): Shenzhen BIGTREE technology co., LTD. BIG TREE TECH 6. The connection between BIGTREETECH SKR 2 and power failure (UPS 24V ): 7.

9 Connection between BIGTREETECH SKR 2 and RGB-LED drive: Shenzhen BIGTREE technology co., LTD. BIG TREE TECH the BIGTREETECH SKR 2 to a Raspberry Pi using TTL UART: Shenzhen BIGTREE technology co., LTD. BIG TREE TECH 9. Connection between BIGTREETECH SKR 2 and closed-loop drive: 10. U disk function and RRF WIFI function selection: U disk function: When the U disk function is selected, the WIFI module only works in UART mode. At this time, RRF firmware cannot be used, only Marlin firmware can be used; Shenzhen BIGTREE technology co., LTD. BIG TREE TECH RRF WIFI function: If selected (as per the jumper configuration below), the U disk function will not be available as WIFI will work through SPI mode, and RRF firmware can be used.

10 V. Motherboard firmware description The motherboard comes pre-installed with firmware that is used for testing at the factory. The firmware is configured for use with an i3 style printer however you will likely find it useful to configure and install your own firmware. Due to the abundance of printer types and firmware distributions in the market, BIGTREETECH cannot offer customized firmware for each application. You may, however, be able to find firmware for you application by trying one of the following: Ask customer service or technical personnel to obtain; Compile your own using a distribution of your choice. Download from our original website: If you decide to use Marlin then you will need to download the source code, use Visual Studio Code to configure the code to your application, find the file within the pio-build folder, copy it to the SD card and then reset the motherboard.